1 /* BFD back-end definitions used by all NetBSD targets.
2    Copyright (C) 1990-2016 Free Software Foundation, Inc.
3 
4    This file is part of BFD, the Binary File Descriptor library.
5 
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 3 of the License, or
9    (at your option) any later version.
10 
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15 
16    You should have received a copy of the GNU General Public License
17    along with this program; if not, write to the Free Software
18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19    MA 02110-1301, USA.  */
20 
21 
22 /* Check for our machine type (part of magic number).  */
23 #ifndef MACHTYPE_OK
24 #define MACHTYPE_OK(m) ((m) == DEFAULT_MID || (m) == M_UNKNOWN)
25 #endif
26 
27 /* This is the normal load address for executables.  */
28 #define TEXT_START_ADDR		TARGET_PAGE_SIZE
29 
30 /* NetBSD ZMAGIC has its header in the text segment.  */
31 #define N_HEADER_IN_TEXT(x)	1
32 
33 /* Determine if this is a shared library using the flags.  */
34 #define N_SHARED_LIB(x) 	(N_DYNAMIC (x))
35 
36 /* We have 6 bits of flags and 10 bits of machine ID.  */
37 #define N_MACHTYPE(execp) \
38 	((enum machine_type) (((execp)->a_info >> 16) & 0x03ff))
39 #define N_FLAGS(execp) \
40 	(((execp)->a_info >> 26) & 0x3f)
41 
42 #define N_SET_INFO(execp, magic, type, flags) \
43 	((execp)->a_info = ((magic) & 0xffff) \
44 	 | (((int) (type) & 0x3ff) << 16) \
45 	 | (((flags) & 0x3f) << 24))
46 #define N_SET_MACHTYPE(execp, machtype) \
47 	((execp)->a_info = \
48          ((execp)->a_info & 0xfb00ffff) | ((((int) (machtype)) & 0x3ff) << 16))
49 #define N_SET_FLAGS(execp, flags) \
50 	((execp)->a_info = \
51 	 ((execp)->a_info & 0x03ffffff) | ((flags & 0x03f) << 26))
52 
53 #include "sysdep.h"
54 #include "bfd.h"
55 #include "libbfd.h"
56 #include "libaout.h"
57 
58 /* On NetBSD, the magic number is always in ntohl's "network" (big-endian)
59    format.  */
60 #define SWAP_MAGIC(ext) bfd_getb32 (ext)
61 
62 /* On NetBSD, the entry point may be taken to be the start of the text
63    section.  */
64 #define MY_entry_is_text_address 1
65 
66 #define MY_write_object_contents MY (write_object_contents)
67 static bfd_boolean MY (write_object_contents) (bfd *);
68 
69 #define MY_text_includes_header 1
70 
71 #include "aout-target.h"
72 
73 /* Write an object file.
74    Section contents have already been written.  We write the
75    file header, symbols, and relocation.  */
76 
77 static bfd_boolean
MY(write_object_contents)78 MY (write_object_contents) (bfd *abfd)
79 {
80   struct external_exec exec_bytes;
81   struct internal_exec *execp = exec_hdr (abfd);
82 
83   /* We must make certain that the magic number has been set.  This
84      will normally have been done by set_section_contents, but only if
85      there actually are some section contents.  */
86   if (! abfd->output_has_begun)
87     NAME (aout, adjust_sizes_and_vmas) (abfd);
88 
89   obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
90 
91   /* Magic number, maestro, please!  */
92   switch (bfd_get_arch(abfd))
93     {
94     case DEFAULT_ARCH:
95       N_SET_MACHTYPE (execp, DEFAULT_MID);
96       break;
97     default:
98       N_SET_MACHTYPE (execp, M_UNKNOWN);
99       break;
100     }
101 
102   /* The NetBSD magic number is always big-endian.  */
103 #ifndef TARGET_IS_BIG_ENDIAN_P
104   /* XXX aren't there any macro to change byteorder of a word independent of
105      the host's or target's endiannesses?  */
106   execp->a_info
107     = (execp->a_info & 0xff) << 24 | (execp->a_info & 0xff00) << 8
108       | (execp->a_info & 0xff0000) >> 8 | (execp->a_info & 0xff000000) >> 24;
109 #endif
110 
111   WRITE_HEADERS (abfd, execp);
112 
113   return TRUE;
114 }
115